It is made of cold-rolled steel plate and reinforced by metal small iron plate. The Tray Holder is made to hold the laptop and projector on a tripod to simplify your presentation setup, generate a nice Display effect. Female screw adapter,with 1 or 4inch Convert Screw Adapter fit for all tripod install. Easy to install and remove. The non-slip pads and straps, , susceptible to clean. Easy to operate. It can be used in Stage, Projector, Monitors, Laptop and other equipment. Perfect for offices, classrooms, lecture , meeting rooms or your own home. Projector Tray Holder only, other accessories in the picture is not included! Specifications: Item Type: Projector Tray Holder Size: 39 x 29cm Quantity: 1 Pc Note: No retail package. 1cm=10mm=0.39inch Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Color: Black Material: Metal Package Contents: 1 x Projector Tray Holder Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.